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eventfs: Warn if an eventfs_inode is freed without is_freed being set

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There should never be a case where an evenfs_inode is being freed without
is_freed being set. Add a WARN_ON_ONCE() if it ever happens. That would
mean there was one too many put_ei()s.

Link: https://lore.kernel.org/linux-trace-kernel/20240201161616.843551963@goodmis.org

Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Ajay Kaher <ajay.kaher@broadcom.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Google) 2024-02-01 10:34:47 -05:00
parent 1389358bb0
commit 5a49f99604
1 changed files with 14 additions and 4 deletions
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18
fs/tracefs/event_inode.c
View file

@ -73,6 +73,9 @@ enum {
static void release_ei(struct kref *ref)
{
struct eventfs_inode *ei = container_of(ref, struct eventfs_inode, kref);
WARN_ON_ONCE(!ei->is_freed);
kfree(ei->entry_attrs);
kfree_const(ei->name);
kfree_rcu(ei, rcu);
@ -84,6 +87,14 @@ static inline void put_ei(struct eventfs_inode *ei)
kref_put(&ei->kref, release_ei);
}
static inline void free_ei(struct eventfs_inode *ei)
{
if (ei) {
ei->is_freed = 1;
put_ei(ei);
}
}
static inline struct eventfs_inode *get_ei(struct eventfs_inode *ei)
{
if (ei)
@ -679,7 +690,7 @@ struct eventfs_inode *eventfs_create_dir(const char *name, struct eventfs_inode
/* Was the parent freed? */
if (list_empty(&ei->list)) {
put_ei(ei);
free_ei(ei);
ei = NULL;
}
return ei;
@ -770,7 +781,7 @@ struct eventfs_inode *eventfs_create_events_dir(const char *name, struct dentry
return ei;
fail:
put_ei(ei);
free_ei(ei);
tracefs_failed_creating(dentry);
return ERR_PTR(-ENOMEM);
}
@ -801,9 +812,8 @@ static void eventfs_remove_rec(struct eventfs_inode *ei, int level)
list_for_each_entry(ei_child, &ei->children, list)
eventfs_remove_rec(ei_child, level + 1);
ei->is_freed = 1;
list_del(&ei->list);
put_ei(ei);
free_ei(ei);
}
/**